This episode of The Expanse had the most anxiety-producing final 10 minutes of any episode so far! And, the welcome return of a character SOME of us have been waiting for quite a while now. A continuing theme is loyalty in the face of extreme unknown and threatening circumstances.
Most people have a very bad habit of classifying large chunks of people in binary terms as either all "bad" or all "good." But the reality is that there is ALWAYS a mix of good and bad people, as well as good and bad IN people. In The Expanse, many viewers have taken the side of the Belters. Some, because they love certain characters, like Naomi and Miller. Others, because as a class, the Belters are the clear underdogs. Generally, they risk life and limb for rich corporate owners who apparently couldn't care less about them, either individually or as a group. Fans of Earthers tend to like Holden or, really, Avasarala. They have exposed their imperfections, as well. Amos is a fascinating Earther, beloved and feared all at once. Martian fans like Alex, or more recently, Bobbie. The Mars faction is a little less developed than the Earther or Belter factions in terms of quantities of deep characters or back stories (so far). This episode really digs into the issue of the risk of thinking of a group as all "good" or "bad," especially if you unequivocally favor Belters. This was a completely packed episode. Although they were always evident, the fault lines between the Belters and the Earthers have deepened to an unsustainable level. It's provoking the very worst behavior, and every time people do their worst, it just causes terrible repercussions. This episode made quite a few Belters look extremely bad. The Belter on the refugee ship spacing completely innocent people, and the Belters who are willing to send nuclear missiles to blast Earth (despite the fact that there are BILLIONS of innocent people there, as well) honestly represent the worst of humanity. Personalizing the impact of awful actions makes everyone realize the consequences, but it doesn't seem to be enough to stop people from behaving dreadfully. This episode had room for personal development, as well, as we see Amos still working through his issues resulting from interacting with kids and just how close he is to being out of control. The episode ratcheted up the tension by continuing to provide so many indicators that Drummer was the traitor, only to have her satisfyingly vindicated.